Arecent trend among environmentalists (e.g., Aldo Leopold) of basing ethical norms for land use, resource management, and conservation on ecological principies such as homeostasis is examined, and a way to justify such an ethical approach through analysis of moral judgment is explored. Issues such as the is/ought impasse, the connection between value judgments and reasons for acting, and the question of whether moral judgments are definitive and categorical are treated as they relate to an ecological ethic, i.e., an environmental ethic grounded in ecological science. I argue that such an ethic is in such regards as sound as more traditional approaches